I'm after papers by Jason in which he has specifically done work separating cohorts: e.g. separating CF from CFS, or CFS from ME, or CFS without PEM from CFS with PEM. And also papers in which he specifically demonstrates that Fukuda selects patients with other disorders (e.g. psychiatric disorders, or idiopathic fatigue, etc.) Has anyone got the details to hand of any relevant papers, please? Thanku to anyone who can assist.